Seems reasonable. Apple has sold two iPad generations, four iPod Touch generations, and five iPhone generations. Of those 11 product generations, ONLY TWO have been named by their version number!
All the iPod Touch generations have kept the same name (ditto for MacBook Air, iMac, and many other Apple products).
The original iPad and iPhone had no version number, the iPhone 3G was the second iPhone (named for a wireless standard!) and the two S models were named for speed, tacked onto the previous name.
Thats 9 iOS models named for something other than their version number. Only the iPhone 4 and iPad 2 have been named for their version number.
So the numbers are not a pattern. (Nor is the S... out of 11 iOS products, not counting Apple TV, only two have used the S naming system so far. The convention makes sense, but Id hardly use it to predict anything.)
It makes a lot of sense.
Apple won't want to keep naming their products by numbers, what if they get to something like the iPad 14. Just sounds silly.
Very true, however, after that comes the iPad 15... Mmmmmm... iPad 15. I want one.